Answer:
b
Step-by-step explanation:
Answer:
225 sq. Ft
Step-by-step explanation:
Key words in the question;
Dilated - This means increased pr expanded
Scale factor of 3 - This basically means multiplied by 3
Old square = 75 sq. Ft
This means;
New are = Old area * 3
New area = 75 * 3 = 225 sq. Ft
The to your question answer is 1
To find the instantaneous rate of change of the function f(x,y) = x^2 + ln(y) at (3,1) to (1,2), we can use the partial derivatives with respect to x and y:
fx(x,y) = 2x
fy(x,y) = 1/y
Then, we can use the gradient vector to find the direction of maximum increase:
∇f(x,y) = <fx(x,y), fy(x,y)> = <2x, 1/y>
At point (3,1), the gradient vector is:
∇f(3,1) = <6, 1>
At point (1,2), the gradient vector is:
∇f(1,2) = <2, 1/2>
To find the instantaneous rate of change from (3,1) to (1,2), we can use the formula for directional derivative:
Dv(f) = ∇f(x,y) · v
where v is the unit vector in the direction from (3,1) to (1,2). The direction vector v is given by:
v = <1, 2> - <3, 1> = <-2, 1>
To make v a unit vector, we need to normalize it by dividing it by its length:
|v| = sqrt((-2)^2 + 1^2) = sqrt(5)
u = v/|v| = <-2/sqrt(5), 1/sqrt(5)>
Then, the instantaneous rate of change from (3,1) to (1,2) is:
Dv(f) = ∇f(3,1) · u = <6, 1> · <-2/sqrt(5), 1/sqrt(5)> = (-12/sqrt(5)) + (1/sqrt(5)) = -11/sqrt(5)
Therefore, the instantaneous rate of change of the function f(x,y) = x^2 + ln(y) from (3,1) to (1,2) is -11/sqrt(5).
To learn more about instantaneous rate of change refer below:
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